<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <input type="button" value="5次666" onclick="study(prompt('输入次数'))">
    <input onclick="alert('5')">
    <script>
        function study(count){
            for(let i = 0; i<count;i++){
                document.write("666<br>")
            }
        }
    </script>
</body>
</html>
